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1999MNRAS.307..111R - Mon. Not. R. Astron. Soc., 307, 111-121 (1999/July-3)
Modelling ISO galaxy counts with luminosity and merger rate evolution.
ROCHE N. and EALES S.A.
Abstract (from CDS):
Our models suggest that the steep number count of 6.75-µm sources can be explained primarily by the evolving E/S0 galaxies. About one-third of 6.75-µm sources do appear to be E/S0s or early-type spirals, but starburst galaxies at 0.6<z<1.1 are more prominent in this passband than we expected. In the 15-µm passband the main contributors appear to be evolving, star-forming spirals and starbursting galaxy mergers, as in our model. Visibly interacting galaxies form ∼31 per cent of the 15-µm detections to 200µJy, and have high mid-infrared/optical flux ratios consistent with our models for major starbursts with high dust extinction (up to ∼1.8mag in the rest-frame blue band). The numbers and high mean redshift (0.68±0.08) of merging/interacting galaxies detected in these ISO surveys are only consistent with the local mid-infrared luminosity function if the merger-triggered starbursts undergo significant luminosity evolution, of ~(1+z)2 to z∼1, in addition to the ~(1+z)2 number evolution reflecting the increase with redshift in the fraction of merging/interacting galaxies (as estimated from optical surveys).
Abstract Copyright: 1999, Royal Astronomical Society
Journal keyword(s): methods: miscellaneous - galaxies: evolution - infrared: galaxies
Simbad objects: 3
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